How much do you like making beds? Expect 4 years as an SO.
744= 3 trips per month = 6 sectors per month = 72 sectors per year = times two bunks (SO makes both on this fleet) = 144 bunks per month = 576 beds to make.
777 = 2 ULH per month, just make your own bed.= 192 bunks over same time frame
Therefore choosing 744 means 384 more beds to make
Also you will incur some permanent hearing loss on 744 over 4 years due to no noise canceling headset on pax fleet and a supersonic shockwave attached to the no.2 window about 12 inches from your ear.